Patent US4070683A successfully refreshed from Google Patents.
US4070683A
Expired / Lapsed
US
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Optical surface topography mapping system
Assignee: Individual
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Filing: 1976-03-04
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Granted: 1978-01-24
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Expires: 1996-03-04
Abstract
Abstract A first laser beam is reflected from the front and rear surfaces of a partially silvered glass slab generating a diverging set of interference fringes which are collimated by a positive lens. A second set of fringes is generated by a second laser beam and second partially silvered glass slab and is positioned to project through the first slab and is collimated by the same positive lens. The second pattern is aligned coaxially and mutually perpendicular to the first pattern creating a rectangular parallopiped grid pattern projected upon an observed object.
Inventors
- 👤 Bruce R. Altschuler
- 👤 John Taboada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:56
CPC Classifications
A; A61; A61C; A61C9/00; A61C9/004; A61C9/0046; A61C9/0053; A61C9/006; G; G01; G01B; G01B11/00; G01B11/24; G01B11/25; G01B11/2513; G01C; G01C11/00; G01C11/02
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
132 words
A system for projecting a rectangular grid pattern upon an object comprising: a. a first transparent slab, said first transparent slab having front and rear partially reflecting surfaces; b. a first source of coherent light directed at the first transparent slab generating a first beam of interference fringes; c. a second source of coherent light; d. a second transparent slab, said second transparent slab having partially reflecting front and rear surfaces and being positioned in the path of a second source of coherent light to generate a second beam of interference fringes directed into the first transparent slab at a right angle to that of the first source of coherent light to form a rectangular grid pattern upon the object; and e. means for recording the rectangular grid pattern upon the object.
Claim 2
Independent Claim
132 words
A system for projecting a rectangular grid pattern upon an object comprising: a. a first transparent slab, said first transparent slab having front and rear partially reflecting surfaces; b. a first source of coherent light directed at the first transparent slab generating a first beam of interference fringes; c. a second source of coherent light; d. a second transparent slab, said second transparent slab having partially reflecting front and rear surfaces and being positioned in the path of a second source of coherent light to generate a second beam of interference fringes directed into the first transparent slab at a right angle to that of the first source of coherent light to form a rectangular grid pattern upon the object; and e. means for recording the rectangular grid pattern upon the object.
Claim 3
Dependent Claim
22 words
A system for projecting a rectangular grid pattern according to claim 1 wherein the first and second coherent light sources are lasers.
Claim 4
Dependent Claim
27 words
A system for projecting a rectangular grid pattern according to claim 2 which further comprises a collimating lens interposed between the first transparent slab and the object.
Claim 5
Dependent Claim
20 words
A system for projecting a rectangular grid pattern according to claim 3 wherein the recording means is a photographic camera.
Claim 6
Dependent Claim
29 words
A system for projecting a rectangular grid pattern according to claim 4 wherein the first and second transparent slabs are glass having partial front and rear coatings of silver.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-01-23 | 1981-07-25 | 1982-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-23 | 1985-07-25 | 1986-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-23 | 1989-07-25 | 1990-01-24 | $7700.00 | Window Closed / Lapsed |